Template Shelf is a new plugin for Movable Type 4 that adds a sidebar widget to the template editing screen that allows you to quickly browse templates in your blog. It's a great time-saver as it removes a lot of the back-and-forth previously involved when editing your templates.
One of the best features that Template Shelf provides is the ability to edit templates in the new dialog boxes. This is a great way to make quick changes to templates without having to open them up separately!
Movable Type versions: 4.3